/*
 * Copyright [2013-2021], Alibaba Group Holding Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.alibaba.polardbx.executor.mpp.execution;

import com.alibaba.polardbx.executor.mpp.Threads;
import io.airlift.concurrent.ThreadPoolExecutorMBean;
import org.weakref.jmx.Managed;
import org.weakref.jmx.Nested;

import javax.annotation.PreDestroy;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ThreadPoolExecutor;

import static java.util.concurrent.Executors.newScheduledThreadPool;

public final class TaskManagementExecutor
    implements AutoCloseable {
    private final ScheduledExecutorService taskManagementExecutor;
    private final ThreadPoolExecutorMBean taskManagementExecutorMBean;

    public TaskManagementExecutor() {
        taskManagementExecutor = newScheduledThreadPool(5, Threads.threadsNamed("task-management"));
        taskManagementExecutorMBean = new ThreadPoolExecutorMBean((ThreadPoolExecutor) taskManagementExecutor);
    }

    @PreDestroy
    public void close() {
        taskManagementExecutor.shutdownNow();
    }

    public ScheduledExecutorService getExecutor() {
        return taskManagementExecutor;
    }

    @Managed(description = "Task garbage collector executor")
    @Nested
    public ThreadPoolExecutorMBean getTaskManagementExecutor() {
        return taskManagementExecutorMBean;
    }
}